diff --git a/src/memline.c b/src/memline.c
index b876261..876704a 100644
--- a/src/memline.c
+++ b/src/memline.c
@@ -2647,7 +2647,7 @@
 /*
  * Replace line lnum, with buffering, in current buffer.
  *
- * If copy is TRUE, make a copy of the line, otherwise the line has been
+ * If "copy" is TRUE, make a copy of the line, otherwise the line has been
  * copied to allocated memory already.
  *
  * Check: The caller of this function should probably also call